Many variables contain limitations to the number of bytes they can hold. A byte is generally a single character, however can take up to 6 bytes depending on the complexity of the character. Any variables that exceed these limitations are truncated:

• PageName and all custom traffic variables (props): 100 bytes
• Tracking Codes and all custom conversion variables (eVars): 255 bytes
• URL and Referrer: 255 bytes
• Hierarchy variables: 255 bytes total across all levels
• The transactionID variable can contain any character other than a comma. It should be in the same location where the character limit (100 bytes) is specified. If multi-byte characters are used, multi-byte character support must be enabled in order to avoid problems with unexpected characters in the transactionID.
• Purchase ID: 20 bytes
• Products: 100 bytes for each product category
  100 bytes for each product name
  No overall limit within the entire variable
• Events variable: No overall limit, however each serialized value may only contain 20 bytes
• List props have a 100-byte limit for the entire variable.
• List variables have a 255-byte limit per value, and no total byte limit.